import React from "react";
class Demo extends React.Component {
  constructor(props) {
    super(props);
  }

  render() {
   let isLogin = false;
    return (
      <div>
        <div>
          {isLogin?<h1>13800000000</h1>:<button>立即登录</button>}
        </div>
      </div>
    );
  }
}
export default Demo;